my Ferroli optimax boiler is not working and is showing code noCn?

How to fix my ferrolli boiler with noCn ?

Evelin
March 2021

two good thumps to the bottom left below the clock worked again , the last thump was over a year ago .........happy days , thanks for the advice

Wayne Spiller
April 2016

Took advice thump suggestion wife wouldn't let me thump it so she tried on third or fourth thump hey presto it came back to life six year old max

Stephen and Kate
January 2016

I really didn't believe hitting it would work but I was out of options.

THANK YOU! I hit that sweet spot and it started up.

Many thanks.

Peter R
January 2016

Thank you. This happened on my eight-year-old Ferroli boiler for the first time. Tried google after drawing a blank on the instruction manual. This site was my fourth look, and I was encouraged to see a well-endorsed remedy (ie thump in the indicated spot).

This worked for me after the third thump - what the internet is for!

Barrybloke
November 2015

This is brilliant. Give it a bang n its perfect. I was gettin worried as this boiler has broke down 4times in 10month.!! Theyre rubbish but i av a cheap landlord.! But again thankyou :)

Kez
October 2015

Hitting mine this morning where everyone suggested worked first time, light strike with palm of fist.

Craig mcinnes
August 2015

Same issue, same fix. Worked like a charm!

Dom
July 2015

I was just about to look at replacing my 5 year old Ferroli, after annual problems with the diverter valve and now the 'no CN' Thanks to this post and a slap in the bottom left corner the boiler is fine. THANKS!!

Paul
July 2015

Brilliant. Heating engineer and I "googled" this and succeeded in getting boiler going. Has anyone been in touch with Ferroli! Why do they have an unpublished fault code? (Nocn). The reason maybe that it will initiate a "recall/change" on the PCB. A sticky contact can be caused by introduced moisture though , maybe positioning in kitchens above microwaves/kettles etc will be the consumers issue at the end of it all . thanks for the resolving answer though , pure genius and experienced problem solving

cliff
October 2014

Hit it on the bottom left of the front panel just below the control panel. It makes a longer knocking sound and kicks into action. Hahahah! Brilliant. Who needs ten years of experience when all human knowledge is on the internet. Wonderful.

Darren
June 2014

So glad I foun d this site!
No cn appeared in the display panel but its not listed in the manual faults page! How stupid.
Took this advice and all is well, I wouldnt have had a clue otherwise.
I must say the boiler has been nothing but trouble since being fitted 4years ago. We have had 2new pcbs already. True to say I wouldnt touch another with a barge pole. Even the plumber has stopped fitting them. That tells you something!
Thanks

Jacks mum
August 2013

thank you for helping me with this stupid boiler, mine said no cn and took your advice and banged it in the lower left corner and it now works so again thank you very much for your help

joyce
October 2012

Unbelievable I had to slap it two or three times and it sparked into life.i think I'll become a heating engineer.

Mark the Heating Engineer
July 2012

we used the reasonable tap & it has fired into action!

Hjordan140
June 2012

I had this issue. A sharp bang with the heel of my hand in the lower front left hand corner of the boiler and all was well. I've since called in the professionals and they say the issue is with the timer clock, which they have placed. I will just have to wait and see if the fault has cleared.

Steve
June 2012

Just wanted to say thank you for the advice on this board. Had this problem with my boiler this morning and had four very cold children!
Followed the advice of the sharp tap to the bottom left of the panel and it worked a treat. Should keep us going until the landlord gets round to sending someone out, hopefully.
Thank you.

Clare
January 2012

I came home this evening and found the noCn code on my Ferroli HE 31C. When I couldn't find it listed as a fault in the manual I started surfing the net and really pleased I found this site. I could hear the noise described so tried banging on the casing bottom and side left. I now have a working boiler and can follow up by contacting someone in the morning for a replacement PCB. Thanks to everyone who has left advice and comments.

Kathryn
January 2012

We are just having the same sort of issue with our HE31 boiler. The engineer on the phone suggested that I try tapping (with a reasonable amount of force) in the bottom left corner of the display area surround. To my surprise it worked and the boiler sparked into life once again. Apparently there is a relay that can stick which then isolates the whole board and stops it working. He said that it could possibly keep it working for another 5-6 weeks, long enough for it to be replaced.

Robert
July 2010

hi

normally this is a simple problem either a stuck relay or condensation from the flu has dripped onto the fuse on the pcb and blown it.

if it sounds like the pump is trying to start then makes a noise resembling a woodpecker its the relay just give the boiler a thump at the top left hand side of the thermostat

if its the fuse turn of the supply and replace it either way id still contact ferroli for a new updated pcb

Lee Pearson
October 2009

Same here, boilier didn't work when fitted, had noCn error, low heat output and hot water was cutting out too. Ferroli engineer changed pcb yesterday, it's ok now.

Andy
October 2009

have had this problem with a new one and found it was a faulty pcb which was replaced under warranty

neal
April 2009